I don't know how it happened, but today I looked at the Calibre window and noticed that the information panel at the right of the window was not there anymore. Without it I can't do many of the functions I need to do. Can anyone explain how it happened and how to get it back? Thank you.
Here is a screenshot, showing the area of the window as it is now.
http://gyazo.com/d4da6e2a6d6a2600aa8c51bb9b34ee1d
Frank D